【English】20190312

tokens记号 [ˈtoʊkən]   delimiter characters分隔符字符 [dɪ'lɪmɪtə]  [ˈkærɪktɚs]    argument论据主题[ˈɑ:rgjumənt]

Splits instring into tokens based on the specified list of delimiter characters and returns the nth token, where n is specified by the tokennum argument.